Project 5

CMSC 104, Spring 2003

Project 5 - The Book Fair

Due Date:

Midnight, Thursday April 17

Note: No late projects will be accepted.

Point Value:

This assignment is worth 80 points.

Objectives:

To solve a more complex problem.
To continue practicing using pseudocode to express the solution to a problem.
To continue practicing following the CMSC 104 coding and indentation standards.
To use the C language selection and looping control structures.

Assignment:

Background

UMBC recently held a book fair. As an incentive to customers, they implemented the following discount scheme:

purchase < $50.00 , 5% discount $50.00 <= purchase < $75.00, 10% discount purchase >= $75.00, 15% discount The manager of the bookstore would like you to write a program to determine the following:

the number of 5% discounts given,
the number of 10% discounts given,
the number of 15% discounts given,
the smallest purchase made,
the largest purchase made,
the total cost of all books purchased before tax, and
the total cost of all books purchased after tax (use a 5% tax rate).

Part 1 - The Pseudocode (20 points)

First, write the pseudocode to solve the problem. Be sure that your pseudocode includes the greeting and output labels shown in the sample program run below. Type the pseudocode in to a file called p5pseudo.txt.

Part 2 - The C Code (60 points)

Next, write the corresponding C program. Call it proj5.c.

A data file containing all purchase amounts to use as input to your program will be provided. The last value in the file is -1.0. This is the sentinel value that signals the program to stop reading purchase amounts.

To use the data file as input to your program, you will use Linux redirection. By using redirection, you can tell Linux to read data from a file rather than from the keyboard. The scanf statement that you use in your program will look exactly the same as it would if you were getting your input from the keyboard. But since you will be getting the values from a file instead of from a user typing at the keyboard, you will not need to prompt the user.

When you run your program, use the following command:

a.out < proj5.dat This is how Linux redirection is done. It is saying to run your program and to read the input from the file proj5.dat, rather than the keyboard.

You will need to copy the file proj5.dat into your directory. To do this, go to the directory where you would like to store proj5.dat. Then, use the following command to copy proj5.dat into the directory:

cp /afs/umbc.edu/users/s/m/smitchel/pub/CS104/proj5.dat . Notice that the space and period at the end of the command are part of the command.

Other Notes

To display an integer followed by a literal percent sign (%), use the format string "%d%%"
To display two places after the decimal point, use the format string "%.2f"
You must have a #define preprocessor directive for each of the following items:
- the tax rate (5%)
- one for each of the three discount rates (5%, 10%, 15%)
- one for each of the two discount boundaries (50.00, 75.00)
Using symbolic constants rather than "hard coding" for these values will help to make your program easier to change in the future.

Sample Program Run

Here is an example of what an input data file might look like:

12.50 75.00 8.95 50.00 15.25 82.36 -1.0 Here is the output that would result from using this sample data file:
Book Fair Results Number of 15% purchases was 2 Number of 10% purchases was 1 Number of 5% purchases was 3 Smallest purchase made was $8.95 Largest purchase made was $82.36 Total of all purchases before tax was $244.06 Total of all purchases after tax was $256.26

Your program's output should follow this EXACT format. (The values will be different because the data file proj5.dat is different.)

Coding Standards:

Note that you MUST adhere to the coding standards and indentation style given on the Projects home page. So read them carefully and immediately!

Project Submission:

Submit your project by e-mailing your pseudocode (p5pseudo.txt) and source code (proj5.c) to Gaurav (jolly1@umbc.edu) as attachments. Make the Subject of the e-mail Project 5 so that Gaurav knows what it is. Do NOT send your executable file (a.out) or the input data file (proj5.dat).